Dr. Hahn was the badass cardio surgeon who replaced Burke on Grey's Anatomy. Her character was slow to catch on with fans, and producers let the actress go. Erica's storyline got no real resolution - she went out to the parking lot and was never seen or mentioned again.

Youngest Winslow child Judy didn't get as much screen time as older siblings Laura and Eddie, so when the actress reportedly asked for too much money she was simply let go without explanation. It's a running joke among fans (and Judy's portrayer, Jaimee Lee Foxworth) that Judy went up to her room and never came back.

Mandy, The West Wing

Brash, confident Mandy was brought in as a PR consultant in season one. Not only did she get written off after the season ended, she was simply removed from the show and never mentioned again as if she'd never existed.

Morgan, Boy Meets World

On the first season of Boy Meets World, Eric and Cory had an adorable little sister named Morgan, who disappeared after the first season. Topanga also had a phantom sister named Nebula, who only appeared in one episode and was never mentioned again.

Nikki and Mikey, Saved By the Bell

In the original edition of Saved By the Bell, a few things were different: the kids lived in Indiana and had Hayley Mills for a teacher. The show was revamped - Zack, Lisa, and Screech made it to California, but Nikki and Mikey were replaced by the similar-but-older Jessie and Slater.

Erica, Grey's Anatomy

Dr. Hahn was the badass cardio surgeon who replaced Burke on Grey's Anatomy. Her character was slow to catch on with fans, and producers let the actress go. Erica's storyline got no real resolution - she went out to the parking lot and was never seen or mentioned again.

Tommy, Brothers & Sisters

After Tommy's portrayer, Balthazar Getty, publicly cheated on his wife with Sienna Miller, he left the show to deal with personal issues. Tommy got moved to the back burner with no explanation, leaving the door open in case Getty wanted to return.

Kaitlin, The OC

Penny, Step By Step

Step By Step was all about navigating the wackiness of a blended family, and one of the recurring characters was mom Carol (Suzanne Somers)' sister Penny. As the kids got older and had their own storylines, Penny was phased out of the show.

Joey and Wanda, Big Love

Bill's kid brother Joey was always the good one, staying true to wife Wanda and trying to take care of his loopy parents, but he eventually snapped and murdered compound leader and prophet Roman. He and Wanda went on the lam, and we never saw them again. The last season of the show was apparently too rushed to finish Joey's storyline.

Another character who got Chuck Cunningham'd was Teenie, Bill and Barb's youngest. The actress got too old, so she was replaced and then shipped off to live offscreen with Sarah.

Budd, Wings

After plane mechanic Lowell (Thomas Haden Church) joined the witness protection program, Budd joined the team as his replacement. However, Budd failed to catch on with the audience and disappeared almost as quickly as he'd arrived.

Morgan from Boy Meets World didn’t disappear! She might have taken a hiatus, but I definitely remember her being around in later seasons.

Kait

And as for Kaitlin Cooper, she went away to boarding school. What they didn’t address was how she aged so rapidly. She was a child in the first few episodes, then by season three or four (I forget which) she was a rebellious teen.

Molly Horan

Different actress for Morgan, the first one was so much cuter!

Kristin

Yes the little girl who originally played Morgan didn’t like acting or something and they changed the actress after a hiatus of like 2 years. They even referenced on the show how she was in her room for a long time when the character came back.

BMW was famous for characters vanishing like Mr. Turner and Minkus but they both came back at the end and said they’d been on the other side of the school, which I found funny.

I was just thinking and I am actually shocked Full House didn’t have any egregious missing characters. Maybe a couple women Danny dated but nothing that I remember tooo much.

criolle johnny

Murphey Brown’s baby

Mellin

They mention Hann a bunch of times after she left the show. She even had a little bit of resolution between Her and Torres. I would say Burke was a much better option for disappearing character.